CN2109664U - Full bandpass filter electron frequency divider - Google Patents

Abstract

The utility model relates to a full band pass filter electronic frequency divider, which is an electronic tripartition frequency divider used for the sound reinforcement of the sub band of the audio frequency. Each frequency band of the utility model adopts a band pass filter. Owing to the same filtering mode and the same number of components, the synthetic phase distortion of audio signals of each frequency band is effectively reduced, and the associative perception of the broadcasting sound fields is enhanced.

Description

Full bandpass filter electron frequency divider

The utility model is a kind of electronics tri-frequency divider of using for audio frequency frequency-division section public address of being made up of full band pass filter.

Because the employed filtering mode difference of each frequency range of electronics tri-frequency divider Fig. 2 in the past, the composition of filter, progression are also inequality; Phase distortion in audio frequency range is bigger, and high pitch is leading, and bass lags behind, and the associative perception of replay sound field is poor.

The purpose of this utility model is: provide a kind of phase characteristic good Active crossover device, to improve the sense of reality and the associative perception in the audio frequency replay process.

The purpose of this utility model is achieved in that in full band pass filter Active crossover device, makes the filter composition mode of each frequency division frequency range identical, and filter order is identical, and component number equates; Amount of delay in the audio signal transmission process, phase-shift phase equate; Synthetic one of output in each frequency range of frequency divider does not have phase distortion, the good sound field of associative perception.

In full band pass filter Active crossover device, be provided with audio frequency input, distributor circuit, high pitch bandwidth-limited circuit, middle pitch bandwidth-limited circuit, bass bandwidth-limited circuit, frequency divider power supply.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is the circuit diagram of the utility model Active crossover device.

Fig. 2 is the reference circuit figure of Active crossover device commonly used.

Fig. 3 is the frequency divider power circuit diagram.

In Fig. 1, audio frequency input, distributor circuit " are made up of W1, IC1, R1, R1 ', R1.Potentiometer W1 one end ground connection, another termination audio input signal; Carry out the adjusted audio signal of input range through the W1 sliding end and send into the IC1+ input.The IC1 output links to each other with an input, constitutes voltage follower, to input, output signal carry out buffer compartment from and impedance matching; Audio signal after buffering, coupling is exported by the IC1 output; R1, R1 ', R1 " an end and IC1 output connect together, the other end is connected with high pitch, middle pitch, bass band pass filter respectively; Its effect is the mutual isolation that further improves each frequency division passage, and audio signal is distributed to each corresponding tone filter passage.(related IC1-IC8, the IC2 ' of the utility model Fig. 1, Fig. 2, IC3 ', IC2 ", IC3 " all connect into voltage follower, and model is NE5534).High pitch band pass filter 2 is made up of IC2, IC3 and peripheral cell thereof.IC2, C1, C2, R2, R3 connect into second order standard active high-pass filter.Audio signal enters the positive input terminal of IC2 through R1, C1, C2, and IC2 is connected into voltage follower.R2 one terminates on C1, the C2 tie point, and the other end is connected on the negative input end of IC2, and C1, R2 constitute the first segment high pass filter; One of R3 terminates on the tie point of C2, IC2 positive input terminal, other end ground connection, and C2, R3 constitute the second joint high pass filter.Standard high pass active filter part-frequency point computing formula is:

$\mathrm{fH}=\frac{1}{2\mathrm{\&pi;}\sqrt{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="912280492\_DRIMG1.png"\; state="\{\{state\}\}">R</figure-callout>}2\&CenterDot;\mathrm{<figure-callout\; id="3"\; label="R"\; filenames="912280492\_DRIMG1.png"\; state="\{\{state\}\}">R</figure-callout>}3\&CenterDot;\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="912280492\_DRIMG3.png"\; state="\{\{state\}\}">C</figure-callout>}1\&CenterDot;\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="912280492\_DRIMG1.png"\; state="\{\{state\}\}">C</figure-callout>}2}}$

IC3, R4, R5, C3, C4 connect into second order standard active low-pass filter.Enter the positive input terminal of IC3 by the high audio signal of IC2 output through R4, R5, IC3 is connected into voltage follower.The tie point of C3 one termination R4, R5, another termination IC3 negative input end.R4, C3 constitute the first segment low pass filter; The termination R5 of C4, the tie point of IC3 positive input terminal, other end ground connection, R5, C4 constitute the second joint low pass filter.Standard second order active low-pass filter part-frequency point computing formula is:

$\mathrm{fL}=\frac{1}{2\mathrm{\&pi;}\sqrt{R4\&CenterDot;R5\&CenterDot;\mathrm{<figure-callout\; id="3"\; label="C"\; filenames="912280492\_DRIMG1.png"\; state="\{\{state\}\}">C</figure-callout>}3\&CenterDot;C4}}$

Enter the IC3 low pass filter by the high audio signal of IC2 high pass filter output high-frequency signal high-end carried out the algorithm restriction, just formed a complete high pitch band pass filter.Output signal enters W2 by the output of IC3, signal amplitude is regulated the back exported by the W2 mid point.

Little to the high-frequency signal transmission impedance, big characteristic that capacitor has to the low frequency signal transfer impedance.According to the computing formula of fH and fL as can be known, as long as select suitable R, C numerical value, just can constitute the Audio Band Pass Filter of any frequency range.The interconnective band pass filter of several frequency ranges just can be formed the little Active crossover device of phase distortion.

Middle pitch bandwidth-limited circuit 3 is made up of IC2 ', IC3 ' and peripheral cell thereof.Audio signal enters the second order high pass active filter of IC2 ', C1 ', C2 ', R2 ', R3 ' formation through R1 '; Enter the second order active low-pass filter of IC3 ', R4 ', R5 ', C3 ', C4 ' formation from the high communication number of IC2 ' output; Complete middle pitch bandpass signal enters by IC3 ' output that W3 carries out the amplitude adjustment after the output of W3 mid point.

Bass bandwidth-limited circuit 4 is made up of IC2 ", IC3 " and peripheral circuit thereof.Audio signal is through R1 " enters IC2 ", C1 ", C2 ", R2 ", R3 " constitute second order active high-pass filter; The step low-pass active filter that constitutes from IC2 " output high communication number enter IC3 ", R4 ", R5 ", C3 ", C4 "; Complete bass bandpass signal is by IC3, and " output enters that W4 carries out the amplitude adjustment after the output of W4 mid point.

Frequency divider power circuit 5(Fig. 3), form the standard servo power supply by IC9, IC10 and relevant elements.

Claims (3)

1, a kind of full band pass filter Active crossover device is characterized in that being provided with by W1, IC1, R1, R1 ', R1, and " audio frequency of forming is imported, distributor circuit; One is distributed resistance R 1 to be connected with input distributor circuit output, the high pitch band pass filter of being made up of IC2, IC3, C1-C4, R2-R5, W2; One is distributed resistance R 1 ' be connected with input distributor circuit output, by IC2 ', IC3 ', middle pitch band pass filter that C1 '-C4 ', R2 '-R5 ', W3 formed; One is distributed resistance R 1 with input distributor circuit output " be connected, by IC2 ", IC3 ", C1 " ,-C4 ", R2 " R5 ", the common electronics tri-frequency divider of forming of bass band pass filter institute that W4 formed.

2, full band pass filter Active crossover device according to claim 1 is characterized in that bivalent high-pass filter that the high pitch band pass filter is made up of IC2, C1, C2, R2, R3 connects the second-order low-pass filter that IC3, C3, C4, R4, R5 form and formed; Audio signal distributes resistance R 1 to enter the high pass filter that IC2 forms through the output of input distributor circuit, high communication number enters low pass filter that IC3 forms by the IC2 output and does the logical back of handling of band and deliver to the W2 potentiometer by the IC3 output and carry out the adjustment of high pitch output level, is exported by the W2 mid point.

3, full band pass filter Active crossover device according to claim 1 is characterized in that the bass band pass filter is made up of the second-order low-pass filter that IC2 ", C1 ", C2 ", R2 ", R3 " bivalent high-pass filter of forming connects IC3 ", C3 ", C4 ", R4 ", R5 " form; The high pass filter that audio signal distributes resistance R 1 " to enter IC2 " to form through input distributor circuit output, the low pass filter that high communication number is made up of IC2 " output enters IC3 " is done the logical processing of band back, and " output is delivered to the W4 potentiometer and is carried out the adjustment of bass output level, is exported by the W2 mid point by IC3.

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